JP2008187508A - Woven pattern erasing device, woven pattern erasing method, woven pattern erasing program, and image processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a woven pattern erasing device, a woven pattern erasing method, a woven pattern erasing program, for highly precisely erasing a woven pattern from image data in which a woven pattern has been embedded, and to provide an image processor. <P>SOLUTION: This woven pattern erasing device 1 for erasing a woven pattern from image data 2 in which a woven pattern has been embedded is provided with: a woven pattern erasing means 12 for performing woven pattern erasure processing for erasing a woven pattern from the image data as the object of woven pattern erasure; a woven pattern erasure decision means 13 for performing woven pattern erasure decision for deciding whether or not the woven pattern has been erased from the image data after the woven pattern erasure processing; and a woven pattern erasure control means 11 for controlling the processing of the woven pattern erasing means 12 and the woven pattern erasure decision means 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tint block erasing device, a tint block erasing method, a tint block erasing program, and an image processing device, and in particular, a tint block erasing device, a tint block erasing method, a tint block erasing program, and an image processing device that erases a tint block from image data in which the tint block is embedded. About.

  In recent years, with the high performance of copiers and multi-function peripherals, there has been a problem of unauthorized leakage of confidential documents printed on paper. As the performance of copiers and multifunction peripherals has increased, it has become easier for users to generate a large number of copies indistinguishable from original manuscripts and to scan manuscripts into electronic documents.

  In order to cope with such a problem, some confidential documents are printed with a background pattern embedded by a background pattern printing. The copy-forgery-inhibited pattern printing is a process in which a hidden character string that emerges when copied is embedded in the background of a document and printed. In copy-forgery-inhibited pattern printing, a hidden character string is made inconspicuous by printing a hidden character string with large dots, a pattern with small dots, and a uniform density between the large dots and the small dots. Note that when a copy-forgery-inhibited pattern original is copied, the copying machine or the like reads only the hidden character string printed with large dots, so that the hidden characters are printed.

Incidentally, some conventional copiers and the like can erase a background pattern in order to copy a document or add a new background pattern by a legitimate user. The background pattern is erased by removing large dots and small dots embedded in the background pattern printing from the document. For example, the background pattern is erased by using the background removal function of the document (see, for example, Patent Document 1).
JP 2003-319180 A

  However, since it is not easy to completely erase the large dots and small dots embedded at the time of printing a background pattern from a document in which the background pattern is embedded, after the background pattern erasing process, Sometimes left behind. For example, if a new copy-forgery-inhibited pattern is embedded in a document in a state where the old copy-forgery-inhibited pattern has not been erased from the document, the old copy-forgery-inhibited pattern may affect the new copy-forgery-inhibited pattern.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a tint block erasing apparatus, a tint block erasing method, a tint block erasing program, and an image processing apparatus that erase a tint block with high accuracy from image data in which the tint block is embedded. And

  In order to solve the above problems, the present invention provides a tint block erasing apparatus that erases a tint block from image data in which a tint block is embedded, and performs a tint block erasing process for erasing the tint block from image data to be erased. Controls processing of an erasure unit, a background pattern erasure determination unit that performs a background pattern deletion determination process for determining whether a background pattern has been deleted from the image data after the background pattern deletion process, and the background pattern deletion determination unit and the background pattern deletion determination unit And a tint block erasure control means.

  In order to solve the above problems, the present invention provides a tint block erasing method in a tint block erasing apparatus for erasing a tint block from image data in which a tint block is embedded. A ground pattern erasure step for performing a ground pattern erasure process and a ground pattern erasure determination step for performing a ground pattern erasure determination process for determining whether the ground pattern is erased from the image data after the ground pattern erasure process is performed.

  In order to solve the above problems, the present invention is a copy-forgery-inhibited pattern erasing program executed in a copy-forgery-inhibited pattern erasing apparatus that includes a storage device and an arithmetic processing unit and erases a copy-forgery-inhibited pattern from image data in which the copy-forgery-inhibited pattern is embedded. A copy-forgery-inhibited pattern erasing unit for performing a tint block erasing process for erasing the tint block from image data to be erased by the arithmetic processing unit, and determining whether the tint block has been erased from the image data after the tint block deletion process. A tint block erasure determining unit that performs tint block erasing determination processing, and a tint block erasing control unit that controls processing of the tint block erasing unit and the tint block erasing determination unit.

  Furthermore, in order to solve the above-described problems, the present invention is an image processing apparatus that deletes a background pattern from image data in which a background pattern is embedded, and processes the image data after the background pattern has been deleted, A copy-forgery-inhibited pattern erasing unit for erasing a copy-forgery-inhibited pattern from the data; a copy-forgery-inhibited pattern deciding unit for carrying out a copy-forgery-inhibited pattern determination process for determining whether a copy-forgery-inhibited pattern is erased from the image data after the copy-forgery-inhibited pattern is deleted; A copy-forgery-inhibited pattern control unit that controls processing of the copy-forgery-inhibited pattern deletion unit and the copy-forgery-inhibited pattern determination unit, and that requests processing of the image data after the copy-forgery-inhibited pattern deletion process. And image data processing means for processing the image data after the ground pattern is erased based on the request.

  In addition, what applied the component, expression, or arbitrary combination of the component of this invention to a method, an apparatus, a system, a computer program, a recording medium, a data structure, etc. is also effective as an aspect of this invention.

  According to the present invention, it is possible to provide a tint block erasing device, a tint block erasing method, a tint block erasing program, and an image processing device that erase a tint block with high accuracy from image data in which the tint block is embedded.

  Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings. In the present embodiment, a multifunction peripheral (MFP) will be described as an example of a tint block erasing device and an image processing device that erases a tint block from image data in which the tint block is embedded. Also good.

  FIG. 1 is a block diagram of an example of a multifunction machine according to the present invention. The MFP 1 shown in FIG. 1 includes a scanning unit 10, a background pattern erasure control unit 11, a background pattern deletion unit 12, a background pattern deletion determination unit 13, and a print unit 14. The copy-forgery-inhibited pattern deletion control unit 11, the copy-forgery-inhibited pattern deletion unit 12, and the copy-forgery-inhibited pattern determination unit 13 may be included in the scan unit 10.

  The scan unit 10 scans a document according to a scan (reading) instruction. FIG. 1 shows an example of scanning a document (background pattern embedded document) 2 in which a background pattern is embedded. The copy-forgery-inhibited pattern erasure control unit 11 controls the copy-forgery-inhibited pattern erasure unit 12 and the copy-forgery-inhibited pattern determination unit 13 in response to a request to erase the pattern. The background pattern erasure unit 12 performs a background pattern erasure process in response to the background pattern erasure request. The copy-forgery-inhibited pattern determination unit 13 performs a copy-forgery-inhibited pattern determination process according to “background pattern deletion determination method 1” and “background pattern deletion determination method 2” in response to a request for detection of pattern. The print unit 14 performs print processing in response to a print (print) request. FIG. 1 shows an example of printing a document 3 from which a background pattern has been erased.

  The multifunction device 1 shown in FIG. 1 performs processing according to the procedure shown in FIGS. FIG. 2 is a sequence diagram illustrating an example of processing when the tint block is normally erased. In step S1, for example, the scan unit 10 receives a scan instruction from the user. Upon receiving the scan instruction, the scan unit 10 proceeds to step S2 and performs document scanning.

  The scanning unit 10 proceeds to step S3 after scanning a document according to an instruction or setting from the user, for example. The scanning unit 10 may proceed to step S3 if a background pattern is embedded in the image data read by document scanning, for example. In step S <b> 3, the scan unit 10 issues a background pattern deletion request to the background pattern deletion control unit 11.

  Upon receiving the copy-forgery-inhibited pattern deletion request, the copy-forgery-inhibited pattern erasure control unit 11 proceeds to step S4 and makes a copy-forgery-inhibited pattern deletion request to the copy-forgery-inhibited pattern deletion unit 12. Upon receiving the copy-forgery-inhibited pattern deletion request, the copy-forgery-inhibited pattern erasure unit 12 proceeds to step S5, and performs copy-forgery-inhibited pattern deletion processing for deleting the copy-forgery-inhibited pattern from the image data read by document scanning. Note that the tint block erasing process may use existing technology. In step S 6, the background pattern erasure unit 12 transmits the image data after the background pattern deletion processing (background pattern deletion image data) to the background pattern deletion control unit 11.

  When the copy-forgery-inhibited pattern image data is received, the copy-forgery-inhibited pattern deletion control unit 11 proceeds to step S7, and issues a copy-forgery-inhibited pattern detection request to the copy-forgery-inhibited pattern deletion determination unit 13. Upon receipt of the copy-forgery-inhibited pattern detection request, the copy-forgery-inhibited pattern determination unit 13 proceeds to step S8, and performs a copy-forgery-inhibited pattern determination process by the copy-forgery-inhibited pattern determination method 1 for determining whether the copy-forgery-inhibited pattern is deleted from the copy-forgery-inhibited pattern image data. In step S9, the background pattern deletion determination unit 13 performs a background pattern deletion determination process according to the background pattern deletion determination method 2 for determining whether the background pattern has been deleted from the background pattern deletion image data. The copy-forgery-inhibited pattern determination method 1 and the copy-forgery-inhibited pattern determination method 2 may be different types of copy-forgery-inhibited pattern determination methods. Details of the ground pattern erasure determination method 1 and the ground pattern erasure determination method 2 will be described later.

  In step S10, the background pattern erasure determination unit 13 notifies the background pattern deletion control unit 11 of the determination result of the background pattern deletion determination process by the background pattern deletion determination method 1 and the background pattern deletion determination method 2. Upon receiving the determination result of the ground pattern erasure determination process, the ground pattern erasure control unit 11 proceeds to step S11, and determines whether the ground pattern is erased from the image data after the ground pattern erasure process based on the determination result of the ground pattern erasure determination process. In FIG. 2, the background pattern erasure control unit 11 determines that the background pattern has been deleted from the image data after the background pattern deletion processing.

  In step S 12, the tint block erasure control unit 11 issues a print request to the print unit 14. When the print request is received, the printing unit 14 proceeds to step S13, performs a copy process of the copy-forgery-inhibited pattern image data in response to the print request, and prints the document from which the copy-forgery-inhibited pattern is deleted. After the printing process, the printing unit 14 proceeds to step S14 and notifies the copy-forgery-inhibited pattern erasure control unit 11 that the printing of the original has been successful. The copy-forgery-inhibited pattern erasure control unit 11 proceeds to step S15, notifies the scanning unit 10 that the printing of the original from which the copy-forgery-inhibited pattern has been erased is successful, and ends the processing shown in the sequence diagram of FIG.

  FIG. 3 is a sequence diagram illustrating an example of processing (interruption) when the tint block is not normally erased. Note that steps S21 to S30 in the sequence diagram of FIG. 3 are the same as steps S1 to S10 in the sequence diagram of FIG.

  Upon receipt of the determination result of the ground pattern erasure determination process, the ground pattern erasure control unit 11 proceeds to step S31 and determines whether the ground pattern is erased from the image data after the ground pattern erasure process based on the determination result of the ground pattern erasure determination process. FIG. 3 shows an example in which the background pattern erasure control unit 11 determines that the background pattern has not been deleted from the image data after the background pattern deletion processing.

  In step S32, the background pattern erasure control unit 11 performs an interruption determination process described later, and determines that the process of deleting the background pattern from the image data in which the background pattern is embedded is interrupted. The copy-forgery-inhibited pattern erasure control unit 11 proceeds to step S33, notifies the scan unit 10 that processing for erasing and printing the copy-forgery-inhibited pattern from the image data in which the copy-forgery-inhibited pattern is embedded, and is represented by the sequence diagram of FIG. Terminate the process.

  FIG. 4 is a sequence diagram showing an example of processing (re-erasing) when the tint block is not normally erased. Note that steps S41 to S50 in the sequence diagram of FIG. 4 are the same as steps S1 to S10 in the sequence diagram of FIG.

  When receiving the determination result of the ground pattern erasure determination process, the ground pattern erasure control unit 11 proceeds to step S51, and determines whether the ground pattern is erased from the image data after the ground pattern erasure process based on the determination result of the ground pattern erasure determination process. FIG. 4 shows an example in which the tint block erasure control unit 11 determines that the tint block has not been erased from the image data after the tint block deletion process.

  In step S52, the background pattern erasure control unit 11 performs an interruption determination process described later, and determines to continue the process of deleting the background pattern from the image data in which the background pattern is embedded. Then, the background pattern erasure control unit 11 returns to step S44 and repeats the process.

  The processing of the tint block erasure control unit 11 for realizing the processing shown in the sequence diagrams of FIGS. 2 to 4 is as shown in the flowchart of FIG. FIG. 5 is a flowchart illustrating an example of processing performed by the tint block erasure control unit.

  In step S61, the copy-forgery-inhibited pattern erasure control unit 11 sets image data (scan data) read from the scan unit 10 by document scanning as image data for copy-forgery-inhibited pattern (copy-forgery-inhibited pattern data). In step S62, the background pattern erasure control unit 11 requests the background pattern deletion unit 12 to delete the background pattern, and causes the background pattern deletion unit 12 to perform the background pattern deletion process. In step S63, the copy-forgery-inhibited pattern deletion control unit 11 counts up the number of copy-forgery-inhibited pattern deletion processes. In step S64, the background pattern erasure control unit 11 requests the background pattern deletion determination unit 13 to detect a background pattern, and causes the background pattern deletion determination unit 13 to perform a background pattern deletion determination process.

  In step S65, the copy-forgery-inhibited pattern erasure control unit 11 receives the determination result of the copy-forgery-inhibited pattern deletion determination process from the copy-forgery-inhibited pattern deletion determination unit 13, and determines that the copy-forgery-inhibited pattern cannot be detected from the image data after the copy-forgery-inhibited pattern deletion process. After making a print request to 14, the process shown in the flowchart of FIG. If it is determined that the background pattern can be detected from the image data after the background pattern deletion processing, the background pattern deletion control unit 11 proceeds to step S66 and determines whether or not the number of times of background pattern deletion processing exceeds a predetermined value.

  If it is determined that the number of times of copy-forgery-inhibited pattern deletion processing has not exceeded a predetermined value (a constant value), the copy-forgery-inhibited pattern deletion control unit 11 proceeds to step S67 and sets the copy-forgery-inhibited pattern deletion target data as the next copy-forgery-inhibited pattern deletion target data. Return to step S62. If it is determined that the number of times of copy-forgery-inhibited pattern deletion processing has exceeded a predetermined value, the copy-forgery-inhibited pattern deletion control unit 11 ends the processing represented by the flowchart of FIG.

  The processing of the tint block erasure determination unit 13 for realizing the processing shown in the sequence diagrams of FIGS. 2 to 4 is as shown in the flowchart of FIG. FIG. 6 is a flowchart illustrating an example of processing performed by the tint block erasure determination unit.

  Upon receiving the copy-forgery-inhibited pattern detection request, the copy-forgery-inhibited pattern determination unit 13 proceeds to step S71, and acquires predetermined (specific) pixel information of one line from the image data before the copy-forgery-inhibited pattern deletion process. Proceeding to step S72 following step S71, the background pattern erasure determination unit 13 acquires predetermined one line of pixel information from the image data after the background pattern deletion processing.

  In step S73, the background pattern deletion determination unit 13 performs a background pattern deletion determination process according to the background pattern deletion determination method 1 for determining whether the background pattern is deleted from the background pattern deletion image data. The details of the tint block erasure determination process by the tint block erasure determination method 1 will be described later.

  In step S74, the background pattern erasure determination unit 13 performs a background pattern deletion determination process according to the background pattern deletion determination method 2 for determining whether the background pattern is deleted from the background pattern deletion image data. The details of the tint block erasure determination process by the tint block erasure determination method 2 will be described later.

  Proceeding to step S75, the ground pattern erasure determination unit 13 determines whether the ground pattern erasure determination processing result by the ground pattern erasure determination method 1 and the ground pattern erasure determination method 2 are both the determination result that the ground pattern is erased from the ground pattern erased image data. Determine whether or not.

  If both are the determination results that the background pattern has been deleted from the background pattern deletion image data, the background pattern deletion determination unit 13 proceeds to step S77, determines that the background pattern has been deleted, and ends the processing represented by the flowchart of FIG. . If neither of the determination results indicates that the background pattern has been deleted from the copy-forgery-inhibited pattern data, the background pattern deletion determination unit 13 proceeds to step S76, determines that the background pattern has not been deleted, and is represented by the flowchart of FIG. The process ends.

  In the flowchart of FIG. 6, an example in which predetermined (specific) pixel information of one line is acquired from image data before copy-forgery-inhibited pattern processing in steps S71 and S72. However, pixel information of a plurality of lines is acquired. It may be.

  FIG. 7 is a flowchart illustrating an example of the tint block erasure determination process according to the tint block erasure determination method 1. 8 and 9 are image diagrams for explaining the background pattern erasure determination processing by the background pattern erasure determination method 1. FIG.

  FIG. 8 shows an image in which pixel information of the same line is acquired from the image data 100 before the tint block erasing process and the image data 101 after the tint block erasing process. FIG. 9A shows an example of pixel information (line data) of a line acquired from the image data 100 before the tint block erasing process. FIG. 9B shows an example of pixel information of a line acquired from the image data 101 after the tint block erasing process.

  In step S81, the copy-forgery-inhibited pattern determination unit 13 shows the difference between the line data after the copy-forgery-inhibited pattern shown in FIG. 9B and the line data before the copy-forgery-inhibited pattern shown in FIG. 9A in FIG. Calculate in pixel units as shown. Proceeding to step S82, the tint block erasure determination unit 13 calculates the number of pixels (greater than a certain threshold) having a large difference from FIG.

  In step S83, the background pattern erasure determination unit 13 determines whether the number of pixels having a large difference is equal to or greater than a certain threshold value. If the number of pixels having a large difference is greater than or equal to a certain threshold value, the background pattern erasure determination unit 13 proceeds to step S85, determines that the background pattern has been deleted, and ends the processing represented by the flowchart of FIG. If it is not greater than a certain threshold value, the tint block erasure determination unit 13 proceeds to step S84, determines that the tint block has not been erased, and ends the processing shown in the flowchart of FIG.

  FIG. 10 is a flowchart illustrating an example of the tint block erasure determination process according to the tint block erasure determination method 2. FIG. 11 is an image diagram for explaining the background pattern erasure determination processing by the background pattern erasure determination method 2.

  In step S91, the background pattern erasure determination unit 13 binarizes pixel information (line data) of the line acquired from the image data before the background pattern erasure processing. In step S92, the background pattern erasure determination unit 13 calculates the number of non-continuous black pixels from the binarized line data.

  FIG. 11 (a) shows an example of the processing of step S91 and step S92. The copy-forgery-inhibited pattern determination unit 13 binarizes the line data before the copy-forgery-inhibited pattern deletion process. In FIG. 11A, binarization is performed by setting the black determination pixel to 1 and the white determination pixel to 0. The copy-forgery-inhibited pattern determination unit 13 calculates the number of non-continuous black pixels (1) from the binarized line data.

  In step S93, the background pattern erasure determination unit 13 binarizes pixel information (line data) of the line acquired from the image data after the background pattern deletion processing. In step S94, the background pattern erasure determination unit 13 calculates the number of non-continuous black pixels from the binarized line data.

  In addition, FIG.11 (b) shows an example of the process of step S93 and step S94. The background pattern erasure determination unit 13 binarizes the line data after the background pattern deletion processing. In FIG. 11B, binarization is performed by setting the black determination pixel to 1 and the white determination pixel to 0. The copy-forgery-inhibited pattern determination unit 13 calculates the number of non-continuous black pixels (1) from the binarized line data.

  In step S95, the copy-forgery-inhibited pattern determination unit 13 calculates the difference between the number of discontinuous black pixels calculated from the line data before the copy-forgery-inhibited pattern processing and the number of discontinuous black pixels calculated from the line data after the copy-forgery-inhibited pattern process. To do. In step S96, the copy-forgery-inhibited pattern determination unit 13 has a difference between the number of discontinuous black pixels calculated from the line data before the copy-forgery-inhibited pattern processing and the number of discontinuous black pixels calculated from the line data after the copy-forgery-inhibited pattern process. It is determined whether or not the threshold value is exceeded.

  The copy-forgery-inhibited pattern determination unit 13 determines that the difference between the number of discontinuous black pixels calculated from the line data before the copy-forgery-inhibited pattern processing and the number of discontinuous black pixels calculated from the line data after the copy-forgery-inhibited pattern processing exceeds a certain threshold. Then, the tint block erasure determination unit 13 proceeds to step S98, determines that the tint block has been erased, and ends the processing represented by the flowchart of FIG. If it is not greater than a certain threshold value, the tint block erasure determination unit 13 proceeds to step S97, determines that the tint block has not been erased, and ends the processing represented by the flowchart of FIG.

  According to the present invention, after the tint block erasure process, it can be determined whether or not the tint block has been erased from the image data in which the tint block is embedded. Therefore, according to the present invention, the copy-forgery-inhibited pattern erasure process can be repeatedly performed on the image data determined that the copy-forgery-inhibited pattern has not been erased, and the copy-forgery-inhibited pattern can be erased from the image data in which the copy-forgery-inhibited pattern is embedded. Further, according to the present invention, it is possible to interrupt the processing for the image data determined that the background pattern is not erased.

  The present invention is not limited to the specifically disclosed embodiments, and various modifications and changes can be made without departing from the scope of the claims.

1 is a block diagram of an example of a multifunction machine according to the present invention. FIG. 10 is a sequence diagram illustrating an example of processing when a tint block is normally erased. It is a sequence diagram of an example showing a process (interruption) when a tint block is not normally erased. FIG. 10 is a sequence diagram illustrating an example of processing (re-erasing) when a tint block is not normally erased. It is a flowchart of an example showing the process of a tint block deletion control part. It is a flowchart of an example showing the process of the tint block erasure determination unit. 6 is a flowchart illustrating an example of a tint block erasure determination process according to a tint block deletion determination method 1; 10 is an image diagram for explaining a background pattern erasure determination process by a background pattern erasure determination method 1. FIG. 10 is an image diagram for explaining a background pattern erasure determination process by a background pattern erasure determination method 1. FIG. 12 is a flowchart illustrating an example of a tint block erasure determination process according to a tint block deletion determination method 2; It is an image figure explaining the background pattern erasure determination process by the background pattern erasure determination method 2.

Explanation of symbols

1 MFP 2 Original with embedded background pattern (embedded background pattern)
3 Original with copy-forgery-inhibited pattern 10 Scan section 11 Copy-forgery-inhibited pattern deletion control section 12 Copy-forgery-inhibited pattern deletion section 13 Copy-forgery-inhibition determination section 14 Print section

Claims (20)

A tint block erasing device that erases a tint block from image data embedded with a tint block,
A tint block erasing unit for performing a tint block erasing process for erasing the tint block from image data to be erased;
A tint block erasure determination means for performing a tint block erase determination process for determining whether the tint block is erased from the image data after the tint block erase process;
A tint block erasing apparatus comprising: a tint block erasing control unit that controls processing of the tint block erasing unit and the tint block erasing determination unit.   2. The copy-forgery-inhibited pattern erasure unit according to claim 1, wherein the copy-forgery-inhibited pattern erasure determination unit determines whether the copy-forgery-inhibited pattern has been deleted from the image data after the copy-forgery-inhibited pattern deletion process based on determination results obtained by a plurality of types of copy-forgery-inhibited pattern deletion determination processes. apparatus.   2. The background pattern according to claim 1, wherein the background pattern erasure control unit repeatedly requests the background pattern deletion unit to perform a background pattern deletion process until the background pattern deletion determination unit determines that the background pattern has been deleted from the image data. Eraser.   4. The copy-forgery-inhibited pattern erasure control unit according to claim 3, wherein the copy-forgery-inhibited pattern erasure control unit cancels a request for copy-forgery-inhibited pattern deletion processing to the copy-forgery-inhibited pattern deletion unit when the number of times of the copy-forgery-inhibited pattern deletion process exceeds a predetermined value. apparatus.   The copy-forgery-inhibited pattern erasure determination unit obtains pixel information from at least a part of the image data before the copy-forgery-inhibited pattern and the image data after the copy-forgery-inhibited pattern, and performs the copy-forgery-inhibited pattern determination process using the pixel information. The tint block erasing apparatus according to claim 1. A tint block erasing method in a tint block erasing apparatus that erases a tint block from image data in which a tint block is embedded,
A tint block erasing step for performing a tint block erasing process for erasing the tint block from image data to be erased;
A tint block erasing method, comprising: a tint block erasure determination step for performing a tint block erase determination process for determining whether or not the tint block is erased from the image data after the tint block erase process.   7. The copy-forgery-inhibited pattern erasure according to claim 6, wherein the copy-forgery-inhibited pattern erasure determination step determines whether or not the copy-forgery-inhibited pattern has been deleted from the image data after the copy-forgery-inhibited pattern deletion process based on determination results obtained by a plurality of types of copy-forgery-inhibited pattern deletion determination processes. Method.   7. The tint block erasing method according to claim 6, wherein the tint block erasing process of the tint block erasing step is repeatedly performed until it is determined that the tint block has been erased from the image data in the tint block erase determining step.   9. The tint block erasing method according to claim 8, wherein when the number of times of the tint block erasing process in the tint block erasing step exceeds a predetermined value, the tint block erasing process is stopped.   In the copy-forgery-inhibited pattern determination step, pixel information is acquired from at least a part of the image data before the copy-forgery-inhibited pattern process and the image data after the copy-forgery-inhibited pattern process, and the copy-forgery-inhibited pattern determination process is performed using the pixel information. The tint block erasing method according to claim 6. A copy-forgery-inhibited pattern erasing program that is executed in a copy-forgery-inhibited pattern erasing apparatus that erases a copy-forgery-inhibited pattern from image data in which a copy-forgery-inhibited pattern is embedded,
A copy-forgery-inhibited pattern erasure unit for performing a copy-forgery-inhibited pattern deletion process for erasing the copy-forgery-inhibited pattern from the image data to be erased from the copy-forgery-inhibited pattern;
A tint block erasure determination means for performing a tint block erase determination process for determining whether the tint block is erased from the image data after the tint block erase process;
A tint block erasing program that functions as a tint block erasing control unit that controls processing of the tint block erasing unit and the tint block erasing determination unit.   12. The copy-forgery-inhibited pattern erasure according to claim 11, wherein the copy-forgery-inhibited pattern erasure determination unit determines whether or not the copy-forgery-inhibited pattern is erased from the image data after the copy-forgery-inhibited pattern deletion process, based on determination results obtained by a plurality of types of copy-forgery-inhibited pattern deletion determination processes. program.   12. The copy-forgery-inhibited pattern according to claim 11, wherein the copy-forgery-inhibited pattern deletion control unit repeatedly requests the copy-forgery-inhibited pattern deletion unit to perform copy-forgery-inhibited pattern deletion until the copy-forgery-inhibited pattern determination unit determines that the copy-forgery-inhibited pattern has been deleted from the image data. Erase program.   14. The copy-forgery-inhibited pattern erasure control unit according to claim 13, wherein the copy-forgery-inhibited pattern erasure control unit cancels a request for copy-forgery-inhibited pattern deletion processing to the copy-forgery-inhibited pattern deletion unit when the number of times of the copy-forgery-inhibited pattern deletion process exceeds a predetermined value. program.   The copy-forgery-inhibited pattern erasure determination unit obtains pixel information from at least a part of the image data before the copy-forgery-inhibited pattern and the image data after the copy-forgery-inhibited pattern, and performs the copy-forgery-inhibited pattern determination process using the pixel information. The tint block erasing program according to claim 11. An image processing apparatus that erases a ground pattern from image data in which a ground pattern is embedded, and processes the image data after the ground pattern is erased.
A tint block erasing unit for performing a tint block erasing process for erasing the tint block from image data to be erased;
A tint block erasure determination means for performing a tint block erase determination process for determining whether the tint block is erased from the image data after the tint block erase process;
A copy-forgery-inhibited pattern erasure control unit that controls processing of the copy-forgery-inhibited pattern erasure unit and the copy-forgery-inhibited pattern deletion determination unit, and requests processing for the image data after the copy-forgery-inhibited pattern deletion process;
An image processing apparatus, comprising: image data processing means for processing the image data after erasing the ground pattern, based on a request for the image data from the ground pattern erasure control means.   17. The image processing according to claim 16, wherein the tint block erasure determining unit determines whether the tint block is erased from the image data after the tint block erasing process based on determination results obtained by a plurality of types of tint block erasing determination processes. apparatus.   17. The image according to claim 16, wherein the copy-forgery-inhibited pattern erasure control unit repeatedly requests the copy-forgery-inhibited pattern deletion unit to perform a copy-forgery-inhibited pattern deletion process until the copy-forgery-inhibited pattern determination unit determines that the copy-forgery-inhibited pattern has been deleted from the image data. Processing equipment.   19. The image processing according to claim 18, wherein the copy-forgery-inhibited pattern erasure control unit stops a request for copy-forgery-inhibited pattern deletion processing to the copy-forgery-inhibited pattern deletion unit when the number of times of the copy-forgery-inhibited pattern deletion process exceeds a predetermined value. apparatus.   The copy-forgery-inhibited pattern erasure determination unit obtains pixel information from at least a part of the image data before the copy-forgery-inhibited pattern and the image data after the copy-forgery-inhibited pattern, and performs the copy-forgery-inhibited pattern determination process using the pixel information. The image processing apparatus according to claim 16.

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